Sir Bleoberis is a Knight of the Round Table from Gannes, first mentioned by Chrétien de Troyes. His name may derive from a twelfth-century storyteller named Bleheris mentioned in several texts. Son of Nestor, godson of King Bors, brother to Sir Blamore de Ganis, and cousin to Lancelot; as Bleoberis explains the relationship, he and Blamore "be sister's children unto my lord Sir Lancelot du Lake". He is father of Nestor of the Fountain, and Lord of the Castle of Gannes. He's sometimes called "Bleoberis of the Wilderness". He also tried to kill Gawaine's son, Guinglain, at the Perilous Ford.